:root {
    --bg: #0f1117;
    --surface: #1a1d27;
    --surface2: #22263a;
    --border: #2e3348;
    --accent-union: #00d4aa;
    --accent-dist: #f5a623;
    --accent-blue: #4a9eff;
    --text: #e8eaf0;
    --text-muted: #7b82a0;
    --text-dim: #4a5070;
    --success: #22c55e;
    --danger: #f43f5e;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 1px 3px rgba(0,0,0,0.4);
  }

  [data-theme="light"] {
    --bg: #f4f6fb;
    --surface: #ffffff;
    --surface2: #f0f2f8;
    --border: #73757b;
    --accent-union: #00a887;
    --accent-dist: #d4870a;
    --accent-blue: #2d7dd2;
    --text: #1a1f36;
    --text-muted: #5a6282;
    --text-dim: #9ba3c0;
    --success: #16a34a;
    --danger: #dc2626;
    --shadow: 0 1px 3px rgba(0,0,0,0.1);
  }

  * { box-sizing: border-box; margin: 0; padding: 0; }

  body {
    font-family: 'DM Sans', sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    padding: 16px;
    transition: background 0.25s, color 0.25s;
  }

  .app {
    max-width: 900px;
    margin: 0 auto;
  }

  .header {
    padding: 28px 0 22px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 28px;
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
  }

  .header-left { flex: 1; min-width: 0; }

  .logo {
    display: flex;
    align-items: center;
    gap: 9px;
    flex-shrink: 0;
    text-decoration: none;
    user-select: none;
  }

  .logo-mark {
    width: 38px; height: 38px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--accent-blue) 0%, var(--accent-union) 100%);
    display: flex; align-items: center; justify-content: center;
    flex-shrink: 0;
    box-shadow: 0 2px 8px rgba(74,158,255,0.35);
  }

  .logo-mark svg { width: 20px; height: 20px; }

  .logo-text {
    display: flex;
    flex-direction: column;
    line-height: 1;
  }

  .logo-name {
    font-size: 0.88rem;
    font-weight: 800;
    color: var(--text);
    letter-spacing: -0.02em;
  }

  .logo-sub {
    font-size: 0.62rem;
    color: var(--text-muted);
    font-weight: 500;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    margin-top: 2px;
  }

  .header-controls {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
    margin-top: 4px;
  }

  .theme-toggle {
    width: 52px; height: 28px;
    background: var(--surface2);
    border: 1.5px solid var(--border);
    border-radius: 100px;
    cursor: pointer;
    position: relative;
    transition: background 0.2s, border-color 0.2s;
    flex-shrink: 0;
  }

  .theme-toggle:focus { outline: 2px solid var(--accent-blue); outline-offset: 2px; }

  .toggle-thumb {
    position: absolute;
    top: 3px; left: 3px;
    width: 20px; height: 20px;
    border-radius: 50%;
    background: var(--accent-blue);
    transition: transform 0.22s cubic-bezier(.34,1.56,.64,1);
    display: flex; align-items: center; justify-content: center;
  }

  [data-theme="light"] .toggle-thumb { transform: translateX(24px); }

  .toggle-icon { font-size: 11px; line-height: 1; }

  .header-left h1 {
    font-size: clamp(1.2rem, 3.5vw, 1.7rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text);
  }

  .header-left p {
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-top: 6px;
    font-weight: 400;
  }

  @media (max-width: 520px) {
    .header { flex-direction: column-reverse; gap: 14px; }
    .header-controls { align-self: flex-end; }
    .logo-text { display: none; }
  }

  .pill {
    display: inline-block;
    background: rgba(74,158,255,0.12);
    color: var(--accent-blue);
    font-size: 0.7rem;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: 100px;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    margin-bottom: 10px;
  }

  .step-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 16px;
    transition: background 0.25s, border-color 0.25s;
  }

  .step-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 18px;
  }

  .step-num {
    width: 28px; height: 28px;
    background: var(--accent-blue);
    color: #fff;
    border-radius: 50%;
    font-size: 0.75rem;
    font-weight: 700;
    display: flex; align-items: center; justify-content: center;
    flex-shrink: 0;
  }

  .step-title {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text);
    letter-spacing: -0.01em;
  }

  .grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }

  .grid-3 {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 12px;
  }

  @media (max-width: 600px) {
    .grid-2, .grid-3 { grid-template-columns: 1fr; }
    .proposal-grid { grid-template-columns: 1fr !important; }
  }

  .proposal-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
  }

  .field {
    display: flex;
    flex-direction: column;
    gap: 6px;
  }

  .field label {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.07em;
  }

  .field input,
  .field select {
    background: var(--surface2);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 10px 13px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-family: 'DM Mono', monospace;
    width: 100%;
    transition: border-color 0.15s, box-shadow 0.15s;
    -webkit-appearance: none;
    appearance: none;
    margin-bottom: 25px;
  }

  .field select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%237b82a0' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 32px;
    cursor: pointer;
  }

  .field input:focus,
  .field select:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(74,158,255,0.15);
  }

  .field input.invalid {
    border-color: var(--danger);
    box-shadow: 0 0 0 3px rgba(244,63,94,0.15);
  }

  .field input[readonly] {
    opacity: 0.55;
    cursor: default;
  }

  .field .hint {
    font-size: 0.68rem;
    color: var(--danger);
    display: none;
  }

  .field.has-error .hint { display: block; }

  .proposal-card {
    border-radius: var(--radius);
    padding: 16px;
    border: 1.5px solid;
  }

  .proposal-card.union {
    background: rgba(0,212,170,0.05);
    border-color: rgba(0,212,170,0.25);
  }

  .proposal-card.district {
    background: rgba(245,166,35,0.05);
    border-color: rgba(245,166,35,0.25);
  }

  .proposal-label {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
  }

  .dot {
    width: 8px; height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
  }

  .dot-union { background: var(--accent-union); }
  .dot-dist { background: var(--accent-dist); }

  .proposal-label.union { color: var(--accent-union); }
  .proposal-label.district { color: var(--accent-dist); }

  .sub-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-top: 12px;
  }

  .divider {
    height: 1px;
    background: var(--border);
    margin: 24px 0;
  }

  .results-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 14px;
  }

  .results-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.01em;
  }

  .period-select {
    background: var(--surface2);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 7px 30px 7px 12px;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-family: 'DM Sans', sans-serif;
    font-weight: 500;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='7' viewBox='0 0 10 7'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%237b82a0' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    -webkit-appearance: none;
    appearance: none;
    cursor: pointer;
  }

  .period-select:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(74,158,255,0.15);
  }

  .table-wrap {
    border-radius: var(--radius);
    border: 1px solid var(--border);
    overflow: hidden;
    transition: border-color 0.25s;
  }

  .table-scroll {
    overflow-x: auto;
    max-height: 380px;
    overflow-y: auto;
  }

  table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
    min-width: 400px;
  }

  thead th {
    background: var(--surface2);
    padding: 11px 14px;
    text-align: right;
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.07em;
    position: sticky;
    top: 0;
    z-index: 1;
    border-bottom: 1px solid var(--border);
  }

  thead th:first-child { text-align: left; }

  tbody td {
    padding: 10px 14px;
    text-align: right;
    border-bottom: 1px solid rgba(46,51,72,0.6);
    font-family: 'DM Mono', monospace;
    font-size: 0.82rem;
    color: var(--text);
  }

  tbody td:first-child {
    text-align: left;
    font-family: 'DM Sans', sans-serif;
    color: var(--text-muted);
    font-size: 0.8rem;
  }

  tbody tr:last-child td { border-bottom: none; }
  tbody tr:hover td { background: rgba(255,255,255,0.03); }

  .union-col { color: var(--accent-union) !important; }
  .dist-col { color: var(--accent-dist) !important; }

  .total-row td {
    background: var(--surface2);
    font-weight: 700;
    font-size: 0.88rem !important;
    border-top: 1px solid var(--border);
    text-align: right;
    padding-right: .7rem;
  }

  .diff-pos { color: var(--success) !important; font-weight: 600; }
  .diff-neg { color: var(--danger) !important; font-weight: 600; }

  .highlight-row td {
    background: rgba(74,158,255,0.08);
    font-weight: 700;
    color: var(--text);
  }

  .summary {
    margin-top: 20px;
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--border);
  }

  .summary-inner {
    padding: 28px 24px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 8px;
    position: relative;
  }

  .summary-inner::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse 60% 50% at 50% 0%, rgba(74,158,255,0.08), transparent 70%);
    pointer-events: none;
  }

  .summary-eyebrow {
    font-size: 0.68rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
  }

  .summary-winner {
    font-size: clamp(1.4rem, 5vw, 2rem);
    font-weight: 800;
    letter-spacing: -0.03em;
  }

  .summary-amount {
    font-size: clamp(1rem, 3vw, 1.3rem);
    font-weight: 700;
    font-family: 'DM Mono', monospace;
    color: var(--text);
  }

  .summary-detail {
    font-size: 0.82rem;
    color: var(--text-muted);
    max-width: 360px;
    line-height: 1.5;
  }

  .summary-detail strong { color: var(--text); font-weight: 600; }

  .disclaimer {
    margin-top: 20px;
    padding: 12px 16px;
    border-left: 3px solid var(--border);
    font-size: 0.70rem;
    color: var(--text-muted);
    line-height: 1.6;
    font-style: italic;
  }

  @media (max-width: 480px) {
    body { padding: 10px; }
    .step-card { padding: 16px; }
    .sub-grid { grid-template-columns: 1fr; }
  }